Heat-insulating vessel.



R. MAOHLBTT. HEAT INSULATING VESSEL.

APPLICATION FILED MAY 4, 1909.

Patented Mar. 26, 1912.

' walls. Such bodies, however, are yielding .ductive material, such as asbestos, are com- UNITED STATES PATENT OFFICE nonsmmaonmrr, or NEW roan; N. r.

To all whom it may concern: Be it known that I, ROBERT MACHLETT, a l citizen of the United States, residing in the borough of the Bronx, city of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Heat-Insulating Vessels, of which the following is a specification, reference being had therein to the accom anying drawings, formin part thereof.

y invention relates genera 1y to heat insulating vessels and particularly to double Walled vessels inclosing a vacuum space between them as the insulating medium. It is advisable in vessels of this type to support the two walls relative to each other to prevent the breaking of their connection at the neck; and inasmuch as it is the primary purpose of such vessels to prevent the transer'of ,heat to or from the contents of the flask, it is important that physical contact between the inner. and outer walls be avoided as far as possible. It is also necessary to provide for considerable expansion and contraction of one wall relative to the other. As a means for thus spacin or supporting the two walls relative to eac other, spacing or stiffening bodies of soft, non-heat-conmonly employed, and these stifl'enin%)bodies are held in place in various ways, as y wire holders, by friction, or by the shape of the in character, and furnish a large physical contact between the two walls.

One object of my invention is to provide a support which combines maximum rigidity and minimum physical .contact, thus providing a highly efl'ective support with ne ligible conductivity of heat.

ther objects and advantages of my invention will appear from the following description.

I shall now describe my invention with reference to the accompanying drawings and shall thereafter point out my invention in claims.

Figure 1' is a central sectional elevation of a vessel embodying my invention. Fig. 2 is a horizontal section of the same on the line 2-2 of Fig. 1. Fig. 3 is a view similar to Fig. 1 of a modification of my invention. Fig. 4 is a horizontal section on line 4-4 of the vessel shown-in Fig. 3.

Specification of Letters ratent. Application filed May 4, 1808.

in as the radial linetof the center of each In the illustrated embodiments of my in- .vention I employ a double-walled vessel of nmr-msuna'rme vnssnn.

Patent d Mar. 26, 1912. mm in. 493,868.

vitreous material, having an inner wall 5 and an outer wall 6, cylindrical in form and of contracted upper portion or neck and JOlIlGd at thelr mouth as shown. The air is exhausted from the space between the two walls in the usual'way through the sealin tip 7 formed in the outer wall, thus rovid ing the vacuum insulating medium.

0 minimize the radiationof heat the outer surface of the inner wall 5 and the inner surface of the outer wall 6 maybe coated with silver, as is well known in the art. As the inner wall is joined to the outer wall o'nly'at the neck, it is advisable, as previously stated, to provide a support between the 'walls to prevent breakage at the point of connect-ion, and it is to the means affording this support that my invention particularlyrelates. i

In place of the supports or softstifi'ening bodies usually employed, I provide rigid columns 8 in one wall spannin the distance between the walls. In the il ustrated' embodiments of my invention these rigid columns are of the same material as the outer wall and are formed by the application of a highlydleated implement to the outer wall and the forcin in of the material of the wall at the desired points to.form tapering hollow columns of glass, asshown. These tapering hollow columns of glass, by reason of their diminishing cross-section as they,

approach the inner wall, and of the fact a that they terminate in rounded points, af-

ford little .conducting surface from wall to wall. They are not brought into actual contact with the inner wall, but to prevent this actual contact of lass on glass and to afford a slight cushion ietween the point of the glass column and the inner wall'of the vessel, I employ thin pads or cushions 9 of asbestos paper or other elastic and low heatconductive material between the ti of the columns 8 and the inner wall 5. T ese pads may be seated in shallow pockets formed in the inner wall for this purpose, as shown in Figs. 1 and 2, or the pockets may be omitted, as in Figs. 3 and 4. the pads are first placed against the inner wall in proper positions, being referably moistened to cause suflicient ad erence to hold them in place for a sufficient time, and then the material of the outer wall is 'forced previously described substantially in P Durlng this forc ng 1;; of the glass-support.

In either case,

. preferably in column, the extreme tip'thereof cools su ciently so that when it comes in contact with the pad, it will not injuriously affect it, andthe glass quickly a rigid connecting and supporting column between the two walls. The'number and location of these supports may be variously changed, but in practice I have found three to be a satisfactory number, spaced about equidistantly on a circumferential line, well toward the bottom of the walls. 'In this construction, the tips of the rigid columns impinge against thepads and hold them in place. It is apparent, therefore, that a very small physical contatt is furnished between the inner and outer walls and that the efiiciency' of the heat insulation is impaired to a negligible extent, compared withthe construction in which the full facesof elastic supports are in contact with both walls. Thus the two'walls are connected' together, but at the connection or; each connection the physical contact is reduced to a minimum, and yet the sup-ports are rigid glass, with just enough yielding character by reason of the thin pads to provide for expansion and contraction of the two walls relatively to each .other.

It is obvious that various modifications may be made in the constructions shown and above particularly described within the principle and scope of my invention.

I claim 1. A heat insulating Vessel comprising spaced walls joined at the mouth of the vessel and inclosing a vacuum space between them, and a rigid supporting column in hardens, forming a rigid supporting column integral 3. A' heat insulating vessel comprising spaced 'Walls joined at the mouth of the vessel and inclosing a vacuum space between them, and arigid supporting column integral with the outer wall and extending substantially across the distance between the walls and' terminating'in a tip in close proximity to the inner wall.

4. A heat insulating vessel comprising spaced walls joined at the mouth of the vessel and -.inclosing a vacuum space be- I tween them,.. a rigid supporting column integral with the outer wall -and extending substantially across the distance between the Walls and terminating in a tip in close proximity to the inner wall, and a thin pad of soft material interposed between thetip of. the column the last mentioned wall. A heat insulating vessel comprising spaced walls joined'at the mouth of the vessel and inclosing a vacuum space between.

them, a rigid supporting column integral wit-h'the outer wall and extending substaiv 't-ially across the distance between the walls and termlnatln 1n a tip in close proximity to the inner wa l, the inner wall being provided with a pocket, and a thin pad of soft material in the pocket and interposed between the tip of the column and the inner wall.

6. In a vacuum insulated vessel of the type set forth, comprising an inner and an outer wall united at the mouth of the vessel, a plurality of spacing blocks formed integrally with one of said Walls and extend-- ing across the vacuum space between said walls: the said blocks being constructed of a length to support the inner wall against displacement suflicient to cause rupture at the joint at said mouth.

7-. In a vacuum insulated vessel of the type set forth, a plurality of spacing blocks between the walls thereof, formed integrally with one of sald walls and separate from the other. walland entering recesses therein. In'testimony whereof- I have afiixed my signature in presence of two witnesses.

ROBERT MAOHLETT.

-Witnesses: v

JAMES F. MARTIN, FRANCIS J. FARRELLY. 

